Enhanced magnetic coercivity of α-Fe2O3 obtained from carbonated 2-line ferrihydrite

@article{Vallina2014EnhancedMC,
  title={Enhanced magnetic coercivity of $\alpha$-Fe2O3 obtained from carbonated 2-line ferrihydrite},
  author={Beatriz Vallina and Juan Diego Rodr{\'i}guez-Blanco and A. P. Brown and Liane G. Benning and J. A. Blanco},
  journal={Journal of Nanoparticle Research},
  year={2014},
  volume={16},
  pages={1-13}
}
We report the physical properties of α-Fe2O3 (hematite), synthesized by dry-heating (350–1,000 °C) of a new, poorly ordered iron oxyhydroxide precursor compound that we name carbonated 2-line ferrihydrite. This precursor was characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, electron microscopy, and thermogravimetric analysis, whereas the α-Fe2O3 was studied with X-ray diffraction, scanning and transmission electron microscopy, and magnetic techniques. α-Fe2O3… 

Figures and Tables from this paper

High coercivity α-Fe2O3 nanoparticles prepared by continuous spray pyrolysis
Surfactant free growth of α-Fe2O3 nanoparticles by continuous spray pyrolysis (CoSP) resulted in high coercivity (HC). X-ray diffraction (XRD), Raman spectroscopy, and Fourier transform infrared
Magnetic properties of hematite (α-Fe2O3) nanoparticles prepared by hydrothermal synthesis method
Hematite (α-Fe2O3) nanoparticles are successfully synthesized by using the hydrothermal synthesis method. An X-ray powder diffraction (XRPD) of the sample shows formation of the nanocrystalline
High coercivity in α-Fe2O3 nanostructures synthesized by surfactant-free microwave-assisted solvothermal method
Abstract In this report, the cube-like shaped α-Fe2O3 nanostructures were prepared by the simple microwave-assisted solvothermal method without using any surfactants. The as-prepared samples were
Mesoporous urchin-like α-Fe2O3 superstructures with high coercivity and excellent gas sensing properties
This paper reports the synthesis, morphology, magnetic properties and gas sensing characteristics of mesoporous urchin-like α-Fe2O3 superstructures prepared by one-step thermal decomposition of iron
Sol-gel synthesis and characterization of α-Fe 2 O 3 nanoparticles
Abstract The α-Fe2O3 nanoparticles have been successfully synthesized via sol–gel technique. The lattice parameters, the lattice strain and crystallite size were investigated by X-ray diffraction
The influence of precursors on phase evolution of nano iron oxides/oxyhydroxides: optical and magnetic properties
The present investigation describes the evolution of nano iron oxide/oxyhydroxide phases synthesized under identical conditions of precipitation using different starting reagents. Depending on the
Synthesis, optical and magnetic behavior of (BiFeO3)1− x(α-Fe2O3)x nanocomposites
Abstract (BiFeO3)1−x(α-Fe2O3)x nanocomposites were synthesized from dried gels of BiFeO3 and α-Fe2O3. Samples with x = (0.00 (BiFeO3), 0.25, 0.50 and 1.00 (α-Fe2O3)) were studied using X-rays
Field-dependent Morin Transition and Temperature-Dependent Spin-flop in Synthetic Hematite Nanoparticles
Background: In nano-size α-Fe2O3 particles, the Morin transition temperature was reported to be suppressed. This suppression of the TM in nano-size α-Fe2O3 was suggested to be due to high internal
Dielectric and magnetic response of SrFe12O19–CoFe2O4 composites obtained by solid state reaction
Abstract Nanocomposites of hard magnetic SrFe12O19 hexaferrite and soft magnetic CoFe2O4 spinel with exchange spring interaction were obtained by simple solid state reaction during 8 h and 14 h at
The influence of silicate on transformation pathways of synthetic 2-line ferrihydrite
In this study, a series of synthetic ferrihydrite samples of Si/Fe molar ratios ranging from zero to 1.5 were heated up to 1000 °C using simultaneous TG–DTA equipment. The XRD, FTIR, SEM–EDS and
...
1
2
3
4
...

References

SHOWING 1-10 OF 86 REFERENCES
Synthesis, morphology and microstructure of pomegranate-like hematite (α-Fe2O3) superstructure with high coercivity
Abstract We found novel and superior magnetic properties of the hematite (α-Fe 2 O 3 ) that originate from an internal microstructure of particles and strong inter-particle interactions between
Controllable synthesis and magnetic properties of pure hematite and maghemite nanocrystals from a molecular precursor
Abstract Rodlike and cubiform hematite nanocrystals free of organic contaminants were controllably synthesized via hydrothermal processing of an air-stable metallorganic molecular precursor (ferric
High crystallinity Si‐ferrihydrite: An insight into its Néel temperature and size dependence of magnetic properties
(1) Ferrihydrite, an antiferromagnetic iron oxyhydroxide with resulting magnetization due to uncompensated spins, is of great importance for the cycling of many trace metals in the environment. Four
Synthesis of a α-Fe2O3 nanocrystal in its different morphological attributes : growth mechanism, optical and magnetic properties
Nanospindle and nanorhombohedron and nanocube structured α-Fe2O3 was synthesized by the solvothermal method. An intermixing of ethylenediamine (EN) either with ethanol (EtOH) or water in different
Microwave-hydrothermal synthesis, characterization and properties of rice-like α-Fe2O3 nanorods
Abstract Rice-like α-Fe2O3 nanorods have been successfully synthesized by a simple microwave–hydrothermal route, employing FeCl3·6H2O and ethylenediamine (en) as the starting materials. The phase of
Preparation of nanoparticles and hollow spheres of α-Fe2O3 and their properties
Uniform nanoparticles and hollow microspheres of hematite (α-Fe2O3) were obtained via a hydrothermal method by using iron (III) chloride as a precursor. The effects of reactant concentration,
Facile synthesis and magnetic properties of cross α-Fe 2 O 3 nanorods
Novel cross α-Fe 2 O 3 nanorods were obtained by forced hydrolysis of ferric chloride in the water solution system. The as-obtained products were characterised by X-ray diffraction (XRD),
Single-crystal star-like arrayed particles of hematite: Synthesis, formation mechanism and magnetic properties
Abstract Using urea as a precipitation agent, star-like arrayed hematite (α-Fe 2 O 3 ) particles were prepared by a facile precipitation–oxidation reaction in an aqueous solution containing
Template-free synthesis and characterization of novel 3D urchin-like α-Fe2O3 superstructures
Novel three-dimensional (3D) urchin-like α-Fe2O3 superstructures were successfully prepared by a template-free hydrothermal synthetic route using FeSO4·7H2O and NaClO3 as reagents. The as-obtained
Magnetic greigite (Fe3S4) nanomaterials: Shape-controlled solvothermal synthesis and their calcination conversion into hematite (α-Fe2O3) nanomaterials
Abstract We demonstrated here the solvothermal synthetic method to selectively prepare magnetic greigite (Fe3S4) nanosheets and nanoparticles in the mixed solvents of ethylene glycol (EG) and H2O.
...
1
2
3
4
5
...